纤维再生砖骨料混凝土基本力学性能研究
发布时间：2018-07-16 21:03
【摘要】：纤维再生砖(骨料)混凝土是指以再生砖骨料为基体材料并在其中掺入纤维而制成的新型纤维增强生态材料。纤维再生砖骨料混凝土作为一种新型生态材料,能够克服传统生态材料强度低,延性差,易开裂等缺点,极大地提高了其抗拉强度,增强了其耐久性,不但使建筑垃圾(尤其是建筑废弃砖瓦)得到合理的利用,实现资源的可持续发展和对环境的保护,又解决了课题组中高层生态复合墙体对新型内填材料的需求问题。为使这种新型材料能更好地推广与运用,本文采用试验和理论分析相结合的方法,拟对纤维再生砖混凝土的基本力学性能和受压本构模型进行研究,本文主要研究内容包括:1.选用聚丙烯纤维和钢纤维来配置聚丙烯纤维再生砖混凝土和钢纤维再生砖混凝土,采用正交试验设计方法,进行纤维含量、水灰比、取代率等关键因素对材料强度的敏感性分析,并优化其组分及配比,初步确定纤维再生砖混凝土的最优工艺组合。试验结果及分析表明:对于聚丙烯纤维再生砖混凝土的立方体抗压强度和立方体劈裂抗拉强度,各因素的影响顺序为水灰比纤维含量取代率;对于钢纤维再生砖混凝土的立方体抗压强度,各因素的影响顺序为水灰比纤维含量取代率,对于钢纤维再生砖混凝土的立方体劈裂抗拉强度,各因素的影响顺序为纤维含量水灰比取代率。2.采用单因素试验方法研究聚丙烯纤维再生砖混凝土和钢纤维再生砖混凝土的受压破坏过程和裂缝形态,探讨纤维掺量对这两种材料的轴心抗压强度、弹性模量、强度换算关系的影响趋势,并给出聚丙烯纤维再生砖混凝土立方体抗压强度和轴心抗压强度之间的强度比值系数和立方体抗压强度与劈裂抗拉强度之间的经验公式。试验结果及分析表明:纤维能提高再生砖混凝土的轴心抗压强度,但提高幅度有限;纤维降低了再生砖混凝土的弹性模量。3.采用单因素试验的方法对聚丙烯纤维再生砖混凝土和钢纤维再生砖混凝土的棱柱体试块进行单轴受压试验研究,测定其单轴受压应力-应变全曲线,并分析纤维掺量对受压全曲线上的特征参数和韧性指数的影响;基于试验结果,提出了符合纤维再生砖混凝土的受压本构模型,并结合损伤理论给出了纤维再生砖混凝土的损伤本构模型,研究了纤维再生砖混凝土的损伤演化曲线。试验结果及分析表明:纤维能有效抑制裂缝的发展,提高混凝土的变形能力,改善混凝土的韧性,有效抑制混凝土损伤的发展。
[Abstract]:Fiber recycled brick (aggregate) concrete is a new fiber reinforced ecological material which is made of recycled brick aggregate as matrix material and mixed with fiber. As a new ecological material, fiber recycled brick aggregate concrete can overcome the disadvantages of low strength, poor ductility and easy cracking of traditional ecological materials, and greatly improve its tensile strength and durability. It not only makes the construction waste (especially the building waste brick and tile) get reasonable utilization, realizes the sustainable development of the resources and the protection of the environment, but also solves the problem of the demand for the new type inner filling material of the high-level ecological composite wall in the research group. In order to make this new material more popularized and applied, the basic mechanical properties and compressive constitutive model of fiber recycled brick concrete are studied in this paper by the method of combining test and theoretical analysis. The main contents of this paper include: 1. Polypropylene fiber and steel fiber were used to configure polypropylene fiber recycled brick concrete and steel fiber recycled brick concrete. Orthogonal design method was used to carry out fiber content and water cement ratio. The key factors such as substitution ratio and so on are analyzed to the material strength, and its composition and ratio are optimized, and the optimum process combination of fiber recycled brick concrete is preliminarily determined. The experimental results and analysis show that: for the cube compressive strength and cube splitting tensile strength of polypropylene fiber recycled brick concrete, the influence order of each factor is water cement ratio fiber content substitution rate; For the cube compressive strength of steel fiber recycled brick concrete, the influence order of each factor is the substitution ratio of water cement ratio fiber content, and the cube splitting tensile strength of steel fiber regenerated brick concrete. The influence order of each factor is the substitution ratio of water to cement ratio of fiber content. The compressive failure process and crack morphology of polypropylene fiber recycled brick concrete and steel fiber recycled brick concrete were studied by single factor test method, and the axial compressive strength and elastic modulus of the two materials were discussed. The influence trend of strength conversion relation is given, and the empirical formula between cube compressive strength and axial compressive strength of polypropylene fiber recycled brick concrete and the empirical formula between cube compressive strength and split tensile strength are given. The experimental results and analysis show that the fiber can improve the axial compressive strength of recycled brick concrete, but the range is limited, and the fiber reduces the elastic modulus of recycled brick concrete. Uniaxial compression tests were carried out on the prisms of polypropylene fiber recycled brick concrete and steel fiber recycled brick concrete by single factor test method, and the full stress-strain curves of polypropylene fiber recycled brick concrete and steel fiber recycled brick concrete under uniaxial compression were measured. The influence of fiber content on the characteristic parameters and toughness index of the whole compression curve is analyzed, and based on the experimental results, the compressive constitutive model of fiber regenerated brick concrete is proposed. Based on the damage theory, the damage constitutive model of fiber recycled brick concrete is given, and the damage evolution curve of fiber recycled brick concrete is studied. The experimental results and analysis show that the fiber can effectively inhibit the development of cracks, improve the deformation ability of concrete, improve the toughness of concrete, and effectively inhibit the development of concrete damage.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528
本文编号：2127664
[Abstract]:Fiber recycled brick (aggregate) concrete is a new fiber reinforced ecological material which is made of recycled brick aggregate as matrix material and mixed with fiber. As a new ecological material, fiber recycled brick aggregate concrete can overcome the disadvantages of low strength, poor ductility and easy cracking of traditional ecological materials, and greatly improve its tensile strength and durability. It not only makes the construction waste (especially the building waste brick and tile) get reasonable utilization, realizes the sustainable development of the resources and the protection of the environment, but also solves the problem of the demand for the new type inner filling material of the high-level ecological composite wall in the research group. In order to make this new material more popularized and applied, the basic mechanical properties and compressive constitutive model of fiber recycled brick concrete are studied in this paper by the method of combining test and theoretical analysis. The main contents of this paper include: 1. Polypropylene fiber and steel fiber were used to configure polypropylene fiber recycled brick concrete and steel fiber recycled brick concrete. Orthogonal design method was used to carry out fiber content and water cement ratio. The key factors such as substitution ratio and so on are analyzed to the material strength, and its composition and ratio are optimized, and the optimum process combination of fiber recycled brick concrete is preliminarily determined. The experimental results and analysis show that: for the cube compressive strength and cube splitting tensile strength of polypropylene fiber recycled brick concrete, the influence order of each factor is water cement ratio fiber content substitution rate; For the cube compressive strength of steel fiber recycled brick concrete, the influence order of each factor is the substitution ratio of water cement ratio fiber content, and the cube splitting tensile strength of steel fiber regenerated brick concrete. The influence order of each factor is the substitution ratio of water to cement ratio of fiber content. The compressive failure process and crack morphology of polypropylene fiber recycled brick concrete and steel fiber recycled brick concrete were studied by single factor test method, and the axial compressive strength and elastic modulus of the two materials were discussed. The influence trend of strength conversion relation is given, and the empirical formula between cube compressive strength and axial compressive strength of polypropylene fiber recycled brick concrete and the empirical formula between cube compressive strength and split tensile strength are given. The experimental results and analysis show that the fiber can improve the axial compressive strength of recycled brick concrete, but the range is limited, and the fiber reduces the elastic modulus of recycled brick concrete. Uniaxial compression tests were carried out on the prisms of polypropylene fiber recycled brick concrete and steel fiber recycled brick concrete by single factor test method, and the full stress-strain curves of polypropylene fiber recycled brick concrete and steel fiber recycled brick concrete under uniaxial compression were measured. The influence of fiber content on the characteristic parameters and toughness index of the whole compression curve is analyzed, and based on the experimental results, the compressive constitutive model of fiber regenerated brick concrete is proposed. Based on the damage theory, the damage constitutive model of fiber recycled brick concrete is given, and the damage evolution curve of fiber recycled brick concrete is studied. The experimental results and analysis show that the fiber can effectively inhibit the development of cracks, improve the deformation ability of concrete, improve the toughness of concrete, and effectively inhibit the development of concrete damage.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528
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